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GB 50059-2011: Code for design of 35kV~110kV substation
Status: Valid GB 50059: Evolution and historical versions
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Code for design of 35kV~110kV substation
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Design code for substation (35~110kv)
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Basic data | Standard ID | GB 50059-2011 (GB50059-2011) | | Description (Translated English) | Code for design of 35kV~110kV substation | | Sector / Industry | National Standard | | Classification of Chinese Standard | P62 | | Classification of International Standard | 27.100 | | Word Count Estimation | 69,688 | | Date of Issue | 2011-09-16 | | Date of Implementation | 2012-08-01 | | Older Standard (superseded by this standard) | GB 50059-1992 | | Quoted Standard | GB 5009; GB 50010; GB 50011; GB 50016; GB 50017; GB 50019; GB 50034; GB 50057; GB 50058; GB 50060; GB/T 50062; GB 50063; GBJ 87; GB 50116; GB 50140; GB 50187; GB 50191; GB 50217; GB 50227; GB 50229; GB 50260; GB 3096; GB 5749; GB 8196; GB 8702; GB 8978; GB 9175; GB 10434; GB 10436; GB 12348; GB/T 14285; GB 15707; DL/T 5202; DL/T 620; DL/T 621 | | Regulation (derived from) | Ministry of Housing and Urban-Rural Development Bulletin No.1162 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard applies to the voltage 35kV ~ 110kV, single transformer capacity 5000kV �� A new and more, substation design expansion and renovation project. | GB 50059-2011: Code for design of 35kV~110kV substation---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to standardize the design of substations, make the design of substations conform to relevant national policies and regulations, and meet the requirements of safety, reliability, and economical rationality, this specification is formulated.
1.0.2 This code is applicable to the substation design of new construction, expansion and reconstruction projects with a voltage of 35kV～110kV and a single transformer capacity of 5000kV·A and above.
1.0.3 The design of the substation should be carried out according to the 5-10-year development plan of the project, to achieve a combination of long-term and short-term, focus on the short-term, correctly handle the relationship between short-term construction and long-term development, and reserve expansion as needed possible.
1.0.4 The design of the substation should proceed from the overall situation, make overall plans, and reasonably determine the design scheme according to the load nature, power consumption capacity, and environmental characteristics, combined with the regional development level.
1.0.5 The design of substations should adhere to the principle of saving resources and taking social benefits into consideration.
1.0.6 The design of the substation shall not only comply with this specification, but also comply with the current relevant national standards.
2.Station site selection and station layout
2.0.1 The site selection of the substation shall comply with the relevant provisions of the current national standard "Code for General Layout Design of Industrial Enterprises" GB 50187, and shall meet the following requirements.
1 Should be close to the load center.
2 The layout of substations should take into account the requirements of planning, construction, operation, construction, etc., and should save land.
3 It should be coordinated with the planning of urban and rural areas or industrial and mining enterprises, and it should be convenient for the introduction and extraction of overhead and cable lines.
4 Transportation should be convenient.
5 The surrounding environment should be free from obvious pollution. When the air is polluted, the site should be located at the place least affected by the pollution source.
6 The substation should avoid interaction with adjacent facilities, avoid fire, explosion and other sensitive facilities, and the site selection and design of substations adjacent to explosive hazardous gas areas should comply with the current national standard "Explosion and Fire Hazardous Environments" Relevant provisions of GB 50058 Code for Design of Power Installations.
7.It should have suitable geological, topographical and topographical conditions. The station site should avoid choosing a mineral deposit site with important cultural relics or mining that will affect the substation. If it cannot be avoided, the consent of the relevant department should be obtained.
8 The elevation of the station site should be at the high water level once in 50 years. If it is unavoidable, the station area should have reliable flood control measures or be consistent with the flood control standards of the region (industrial enterprises), and should be higher than the waterlogging level.
9 The main building of the substation should be coordinated with the surrounding environment.
2.0.2 The substation shall select the appropriate type of power distribution device according to the characteristics of the area where it is located, and the seismic design shall comply with the relevant provisions of the current national standard "Code for Seismic Design of Electric Power Facilities" GB 50260.
2.0.3 Substations in urban centers should choose miniaturized and compact electrical equipment.
2.0.4 The layout of the main transformer of the substation should be not only convenient for transportation, but also should be arranged in a position where the operating noise has little impact on the surrounding environment.
2.0.5 The physical wall of the outdoor substation should not be lower than 2.2m. The wall form of urban substations and enterprise substations should be coordinated with the surrounding environment.
2.0.6 The width of the main road in the substation to meet the fire protection requirements should be 4.0m. The width of the main equipment transportation road can be determined according to the transportation requirements, and should have the conditions for carriage return.
2.0.7 The site design slope of the substation should be determined according to the equipment layout, soil conditions and drainage methods. The slope should be 0.5% to 2%, and should not be less than 0.3%. The slope parallel to the direction of the busbar should meet the requirements of electrical and structural layout. requirements. The maximum slope of the road should not be greater than 6%. When the roadside open ditch is used for drainage, the longitudinal slope of the ditch should not be less than 0.5%, and the local difficult section should not be less than 0.3%.
The bottom longitudinal slope of cable trenches and other similar trenches should not be less than 0.5%.
2.0.8 The building elevation, foundation burial depth, subgrade and pipeline burial depth in the substation should be coordinated with each other; the ground elevation inside the building should be 0.3m higher than the ground outside the house, and the wall of the cable trench outside the house should be 0.1m higher than the ground.
2.0.9 The minimum clear distance between various underground pipelines and between underground pipelines and buildings, structures and roads shall meet the requirements of safety, maintenance, installation and workmanship.
2.0.10 The greening planning of the substation area should adapt to the surrounding environment and prevent the greening from affecting safe operation.
3 electrical part
3.1 Main Transformer
3.1.1 The number and capacity of main transformers should be comprehensively determined according to regional power supply conditions, load nature, power consumption capacity and operation mode.
3.1.2 Two main transformers should be installed in substations with primary and secondary loads. When the technology and economy are reasonable, more than two main transformers can be installed. When the substation can obtain working power with sufficient capacity from the medium and low voltage side grids, a main transformer can be installed.
3.1.3 For a substation equipped with two or more main transformers, when one main transformer is disconnected, the capacity of the remaining main transformers (including overload capacity) shall meet the requirements of all primary and secondary loads.
3.1.4 In a substation with three voltages, when the power passing through the windings on each side of the main transformer reaches more than 15% of the rated capacity of the transformer, the main transformer should use a three-winding transformer.
3.1.5 The main transformer should be a low-loss, low-noise transformer.
3.1.6 For substations with large power flow changes and large voltage deviations, if the ordinary transformer cannot meet the voltage quality requirements of the power system and users after calculation, an on-load tap changer should be used.
3.2 Electrical main wiring
3.2.1 The main wiring of the substation should be determined according to the position of the substation in the power grid, the number of outgoing circuits, the characteristics of the equipment and the nature of the load, and should meet the requirements of reliable power supply, flexible operation, convenient operation and maintenance, saving investment and facilitating expansion..
The substation should reduce the voltage level and simplify the wiring under the condition of meeting the power supply planning.
3.2.2 Under the premise of meeting the operation requirements of the substation, the high-voltage side of the substation should adopt the wiring with fewer or no circuit breakers.
3.2.3 35kV ~ 110kV electrical wiring should adopt bridge shape, enlarged bridge shape, line transformer group or line branch wiring, single busbar or single busbar section wiring.
3.2.4 When the 35kV ~ 66kV line has 8 circuits or more, it is advisable to use double busbar wiring. When the 110kV line has 6 circuits or more, it is advisable to use double busbar wiring.
3.2.5 When the substation is equipped with two or more main transformers, the 6kV ~ 10kV electrical wiring should adopt a single bus section, and the sectioning method should meet the load distribution of other main transformers when one of the main transformers is out of service. requirements.
3.2.6 When it is necessary to limit the short-circuit current of the 6kV ~ 10kV line in the substation, one of the following measures can be adopted.
1 Transformers run separately;
2 using a high impedance transformer;
3 Connect the current limiting device in series in the transformer circuit.
3.2.7 The lightning arrester and voltage transformer connected to the busbar can share a group of isolating switches. The lightning arrester connected to the lead wire of the transformer should not be equipped with an isolating switch.
3.3 Power distribution device
3.3.1 The design of substation power distribution devices shall comply with the relevant provisions of the current national standard "Code for Design of 3-110kV High Voltage Power Distribution Devices" GB 50060.
3.3.2 The design of the power distribution device should select resource-saving, environment-friendly, and land-occupying equipment and layout schemes according to the load nature, environmental conditions, and operation and maintenance requirements of the substation.
3.3.3 The design of the power distribution device should be based on the characteristics, scale and development plan of the project, combining far and near, and should focus on the short term.
3.4 Reactive power compensation
3.4.1 The determination of the type and capacity of reactive power compensation devices in substations should be based on the distribution of reactive power and the size of reactive power. The fluctuation amplitude and frequency of reactive power, the generation of user harmonic current and the background harmonic value of the connected power grid are all planned and arranged by the design of the power supply and distribution system.
3.4.2 The design of the reactive power compensation device should comply with the relevant provisions of the current national standard "Code for Design of Parallel Capacitor Devices" GB 50227.
3.4.3 The substation should be equipped with a parallel capacitor device; if necessary, an AC harmonic filter device or a static compensation device that can automatically and quickly adjust the compensation capacity according to reactive load fluctuations should be installed.
3.5 Overvoltage protection and grounding design
3.5.1 The design of substation overvoltage protection shall comply with the relevant provisions of the current industry standard "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" DL/T 620.
3.5.2 Grounding design of AC electrical installations in substations. It should comply with the relevant provisions of the current industry standard "Grounding of AC Electrical Installations" DL/T 621.
3.5.3 The grounding of substation buildings should be determined according to the nature of the load, and should comply with the current national standard "Code for Lightning Protection Design of Buildings" GB 50057 concerning the grounding of the second or third type of lightning protection buildings.
3.6 Station power system
3.6.1 In a substation with two or more main transformers, it is advisable to install two substation transformers with the same capacity as backup for each other, and the capacity of each substation transformer should be selected according to the calculated load of the whole station. The two station transformers can be respectively connected to the busbars of different sections with the lowest voltage level of the main transformer. When a reliable low-voltage backup power supply can be introduced from outside the substation, a station transformer can also be installed.
When the 35kV substation has only one incoming power line and one main transformer, a station transformer can be installed in front of the power incoming circuit breaker.
3.6.2 For substations that need to be equipped with arc-suppression coil compensation devices according to the plan, when the grounding transformer is used to lead out the neutral point, the grounding transformer can be used as a station transformer, and the capacity of the grounding transformer should meet the requirements of the arc-suppression coil and station power capacity requirements.
3.6.3 Station power wiring and power supply mode should meet the following requirements.
1.The low-voltage power distribution of the station should adopt the TN system with the neutral point directly grounded. It should adopt the common power supply method for power and lighting. The rated voltage should be 380V/220V.
2.The low-voltage busbar for station power should adopt single-busbar section wiring, and each station transformer should be connected to a section of busbar; single-busbar wiring can also be used, and two station transformers should be connected to a section of busbar through switching.
3 The important load of power consumption in the station should adopt the double circuit power supply mode.
3.6.4 The substation should be equipped with a fixed maintenance power supply, and a leakage protection device should be installed;
3.7 DC system
3.7.1 The DC bus of the substation should be connected with single bus or single bus section. When a single busbar section is used, the storage battery shall be able to switch to any busbar.
3.7.2 A set of 110V or 220V batteries should be used as the operating power supply, and terminal batteries should not be provided. An important 110kV substation can also be equipped with 2 sets of batteries.
The battery pack should adopt batteries with reliable performance and less maintenance. When the impact load is large, high-rate batteries can also be used.
3.7.3 The charging device should adopt a high-frequency switching charging device.
When a high-frequency switching charging device is used, it is advisable to configure a charging device with a hot spare part, or configure two charging devices.
3.7.4 The capacity of the battery pack shall meet the following requirements.
1 The substation with manned duty shall be the discharge capacity of 1h power outage due to the accident of the whole station.
2.The unattended substation shall have a discharge capacity of 2 hours for a power outage in case of a total station accident.
3 It should meet the requirements of the maximum impact load at the end of accidental discharge.
3.7.5 The DC power supply of the communication equipment can be directly supplied by a group of dedicated batteries independently or by using the DC conversion method of the station batteries.
3.8 Lighting
3.8.1 The lighting design of the substation shall comply with the relevant provisions of the current national standard "Architectural Lighting Design Standard" GB 50034.
3.8.2 Emergency lighting should be installed in the control room, indoor power distribution device room, battery room and main passages in the house.
3.8.3 The installation location of lighting equipment should meet the maintenance safety requirements.
3.8.4 The monitoring screen should avoid obvious reflected glare and direct sunlight.
3.8.5 Explosion-proof illuminators shall be used for lighting in the lead-acid battery room, and non-explosion-proof electrical appliances shall not be installed in the battery room.
3.8.6 The lighting voltage in the cable tunnel should not be higher than 24V. When it is higher than 24V, safety measures to prevent electric shock should be taken.
3.9 Electrical Secondary Arrangement of Control Room
3.9.1 The control room of the manned substation shall be located at a location where operation and management are convenient, the total length of cables is short, the orientation is good, and the main equipment outside the house is convenient to observe.
3.9.2 The arrangement of control panels and cabinets should correspond to the sequence of interval arrangement of power distribution devices.
3.9.3 The building of the control room should be built in the first phase of the project according to the planned capacity of the substation, and the screen position should be determined according to the planned capacity, and there should be room for spare screen positions.
3.9.4 It is not suitable to set up a dedicated control room for unattended substations.
3.10 Monitoring and secondary wiring
3.10.1 The following equipment in the station should be operated or controlled locally.
1.Isolating switch and grounding switch of 6kV～110kV power distribution equipment;
2 Main transformer neutral point grounding disconnector without remote control.
3.10.2 The following equipment in unattended substations should be able to be remotely and locally controlled.
1 All circuit breakers and electric load switches;
2 Main transformer on-load tap changer;
3 The main transformer neutral point grounding disconnector that requires remote control.
3.10.3 The control circuit should be a strong current control circuit. Between remote remote control and station control operations, an operation switching lock should be set.
3.10.4 For substations with manned duty, it is advisable to install on-site accident signal devices that can repeat actions and delay automatic release. Unattended substations should be equipped with remote control devices that meet the requirements of remote operation.
3.10.5 The control circuit of the circuit breaker should have a monitoring signal.
3.10.6 The power distribution device should be equipped with a locking device to prevent electrical misoperation. The locking device to prevent electrical misoperation should adopt a mechanical locking device, and a complete set of switch cabinets should use a mechanical locking device. Indoor partitioned power distribution devices should also be equipped with facilities to prevent accidental entry into live partitions.
The power supply of the blocking chain circuit should be separated from the power supply of the relay protection and control signal circuit.
3.10.7 A clock synchronization system can be set up in substations as required.
3.10.8 The on-load tap changer adjustment of the main transformer in the substation, the switching of parallel capacitor banks, the charging of battery packs, and the regulation of DC bus voltage should adopt automatic control. The on-load tap changer adjustment of the main transformer in the substation and the switching automatic device of the shunt capacitor bank shall have the interface of the remote control device.
3.10.9 The substation should be equipped with a set of AC uninterruptible power supply system that can meet the power supply of important loads of the whole station. The DC power supply should use the DC system in the station, and the load power supply should use radiation mode.
3.10.10 Substations can be equipped with security technology protection systems as required.
3.11 Protection relays and automatic devices
3.11.1 The design of substation relay protection shall comply with the relevant provisions of the current national standard "Technical Regulations for Relay Protection and Safety Automatic Devices" GB/T 14285.
3.11.2 The design of relay protection and automatic devices in substations should also comply with the relevant provisions of the current national standard "Code for Design of Relay Protection and Automatic Devices for Electric Power Installations" GB/T 50062.
3.12 Scheduling automation
3.12.1 The scheduling automation system should be configured according to the requirements of scheduling automation planning and design.
3.12.2 The remote signaling, telemetry, remote control and remote regulation of dispatching automation system should be determined according to the requirements of safety monitoring, dispatching and ensuring power quality, as well as saving investment. The scheduling automation system should meet the requirements of reliable automation information collection and transmission.
3.12.3 There should be at least one independent remote control channel or dispatching data network between the substation and the corresponding dispatching terminal, and the automation channel should be uniformly organized in the communication design.
3.12.4 The dispatch automation system shall be powered by uninterruptible power supply.
3.12.5 Substations should be equipped with secondary system safety protection equipment according to the basic principles of safety partition and dedicated network.
3.13 Metrology and measurement
3.13.1 The design of metering and measuring devices in substations shall comply with the relevant provisions of the current national standard GB 50063 "Code for Design of Electrical Measuring Instrument Devices for Power Installations".
3.13.2 The design of the electric energy metering system of the substation shall comply with the relevant provisions of the current industry standard "Technical Regulations for Design of Electric Energy Metering System" DL/T 5202.
3.14 Communication
3.14.1 For substation communication design, communication equipment should be configured according to local conditions according to the substation's planning capacity, dispatching system and location in the power grid and communication network.
3.14.2 The substation can be equipped with the following communication facilities as required.
1 System dispatching communication. There should be at least one independent dispatching communication channel between the substation and its power grid dispatching organization. The communication methods can be optical fiber communication, microwave communication, power line carrier communication, audio cable communication, etc.
2 Intra-site communication.
3 Communication with relevant operation and maintenance management departments.
4 Communication with the local local office.
3.14.3 The substation can be equipped with a dedicated DC power supply system for communication equipment as needed, the rated DC voltage should be -48V, and the floating charge power supply method should be adopted.
3.14.4 It is not advisable to set up a separate communication room in the substation.
3.15 Cable laying
3.15.1 The design of selection and laying of substation cables shall comply with the relevant provisions of the current national standard "Code for Design of Electric Power Engineering Cables" GB 50217.
3.15.2 The cables of the station power circuit should not be laid in the same channel (ditch, tunnel, shaft). If it is unavoidable, effective fire prevention measures should be taken.
3.15.3 10kV and above high-voltage power cables and control cables should be laid in separate channels (ditches, tunnels, shafts) or other effective fire prevention measures should be taken.
3.15.4 Cable intermediate joints should not be used in substations.
4 civil works
4.1 General provisions
4.1.1 The civil engineering design shall comply with the current national standards "Code for Design of Concrete Structures" GB 50010 and "Code for Design of Steel Structures" GB 50017.
4.1.2 The design of buildings, structures and related facilities should be planned uniformly, with coordinated shapes and good integrity, and should be convenient for production and living. The types of structures and materials selected should be reasonable and simplified.
4.1.3 The design of buildings and structures shall meet the following requirements.
1 For the limit state of bearing capacity, the load (effect) combination shall be carried out according to the basic combination or accidental combination of load effects, and the following formula shall be used for design.
γ0S≤R (4.1.3-1)
In the formula. γ0——structural importance coefficient;
S——the design value of load effect combination;
R——The design value of structural component resistance should be determined according to the relevant provisions of the current national standards "Code for Design of Concrete Structures" GB 50010 and "Code for Design of Steel Structures" GB 50017.
2 For the limit state of normal service, the standard combination, frequent combination or quasi-permanent combination of loads shall be adopted according to different design requirements. And should be designed as follows.
S≤C (4.1.3-2)
In the formula. C——The specified limit value of the structure or structural components to meet the requirements of normal use, which should be adopted in accordance with the relevant provisions of the current national standards "Code for Design of Concrete Structures" GB 50010 and "Code for Design of Steel Structures" GB 50017, and should not exceed this code Provisions of Appendix A.
4.1.4 The safety level of buildings and structures should not be lower than Class II, and the corresponding structural importance coefficient should not be less than 1.0.
4.1.5 For the foundations of structures, brackets and other structures, when the uplift or overturning stability is checked, the load effect should be based on the basic combination of load effects in the limit state of the bearing capacity, and the sub-item coefficients should be 1.0.The uplift or overturning moment of the foundation shall be less than or equal to the foundation's pullout force or overturning moment divided by the stability factor in Table 4.1.5.When the foundation is below a stable water table, the effect of buoyancy should be taken into account.
Note. KS——used to calculate the anti-overturning moment of the foundation according to the ultimate soil resistance and to calculate the uplift resistance according to the conical soil;
KG——Used to calculate the anti-overturning moment or pull-out force based on the self-weight of the foundation plus the soil weight above the steps.
4.2 Loads
4.2.1 The loads on the structure can be classified as follows.
1 The self-weight of the structure, the self-weight and horizontal tension of conductors and lightning conductors, permanent loads such as fixed equipment weight, soil weight, earth pressure, and water pressure;
2 Variable loads such as wind load, ice load, snow load, live load, temporary load during installation and maintenance, earthquake action, temperature change, etc.;
3 Short-circuit electrodynamic force, checked (rare) wind load and checked (rare) ice load and other occasional loads.
4.2.2 The adoption of load partial coefficients shall meet the following requirements.
1 The sub-item coefficients of permanent load and variable load shall be selected according to the relevant provisions of the current national standards "Code for Loads of Building Structures" GB 50009 and "Code for Seismic Design of Buildings" GB 50011;
2 When it is beneficial to the overturning, sliding or floating check calculation of the structure, the sub-item factor of the permanent load shall be 0.9;
3 The partial coefficient of accidental load should be 1.0;
4 The sub-item coefficient of conductor load shall be taken according to the values in Table 4.2.2.
4.2.3
The load combination value factor for variable loads shall be adopted in accordance with the following requirements.
The basic combination of housing construction. the wind load combination value coefficient should be 0.6.
Strong wind conditions of structures. The combined value coefficient of temperature change effect of continuous structures should be 0.85.
The most serious icing situation of structures. the wind load combined value coefficient should be 0.15 (ice thickness ≤ 10mm) or 0.25 (ice thickness > 10mm).
Installation or maintenance of structures. The wind load combined value coefficient should be 0.15.
Earthquake action conditions. The combined live load coefficient of buildings should be 0.5, the combined wind load coefficient of structures should be 0.2, and the combined ice load coefficient of structures should be 0.5.
4.2.4
The values of floor and roof live loads and related coefficients of building buildings should not be lower than the values listed in Table 4.2.4.When the load standard value of equipment and means of transportation is greater than the value in Table 4.2.4, the design shall be carried out according to the actual load.
4.2.5
The frame and its foundation should be designed according to the actual stress conditions, including the unfavorable conditions that may occur in the future, respectively according to the terminal or intermediate frame. Conditions for checking deformation and cracks.
For the operation conditions, the design maximum wind load (no ice, corresponding air temperature), the lowest air temperature (no ice, no wind) and the most serious icing (corresponding air temperature, wind load) and the corresponding wires shall be taken once in 50 years. And lightning cable tension, self-weight, etc.
The installation situation, the erection of the guide line and the lightning protection line, should take into account the weight of 2kN of people and tools acting on the beam, as well as the corresponding wind load (the wind speed is calculated as 10m/s), the tension of the conductor and the lightning protection line, and its own weight.
For the maintenance situation, take the two cases of three-phase simultaneous power-off maintenance and single-phase mid-span live maintenance, as well as the corresponding wind load (wind speed is taken as 10m/s), wire tension, self-weight, etc. For the case where there is no down conductor within the retaining distance, the mid-span upper person load may not be added.
In case of earthquake, horizontal earthquake action and corresponding wind load or corresponding ice load, tension of conductors and lightning conductors, self-weight, etc. shall be taken into consideration. The structural resistance or bearing capacity adjustment factor under earthquake shall be in accordance with the current national standard "Code for Seismic Design of Structures" "GB 50191 selection of the relevant provisions.
4.2.6
The equipment support and its foundation should be regarded as the three basic combinations of the limit state of the bearing capacity according to the following load conditions, and the deformation and cracks should be checked according to the limit state conditions of normal use...
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